This is one of the first mods I did on my S4, as I HATE driveline slop under deceleration or in traffic.
I'm not as familiar with the driveline of the 86 though. I know that there are both bushings and mounts, and then this Whiteline kit.
FT86SF has some packages that have both the Whiteline kit and a Perrin trans mount. The mount is aluminum, with almost no deflection allowed. With both of those on (on a DD street car), would the NVH be too crazy? I hate not having a tight driveline, but don't want to shake the mirrors loose either.